I don't know about the Barmote Court, but I do know about MASHAM and the H&S At Work Act.
I would tend to feel that Barmote and Stannary Courts alike, are about like Magna Carta - long since overtaken and superseded by more modern legislation and still in existence because no-one has bothered to repeal it in so many words, but of no practical value in todays' courts.
Those MPs who tried to claim that a long-disused law meant they were effectively immune from prosecution didn't have much success
landowners have a duty of care in respect of abandoned and derelict mine workings on their land, both to their employees and to third parties such as walkers on footpaths and rights of way.
this
doesn't mean they have any of the duties incumbent on the Mine Owner.
There was a lot of discussion of this in the formative stages at Combe Down. The Council ( BaNES ) didn't want to take on the role of Mine Owner and various alternatives were explored to avoid this. If the site had been bought out and allowed to collapse as and when, as was seriously examined and as is sometimes done in former colliery areas, BaNES would not have had the Mine Owner role.
HMIM were not happy with this, but it's the law. Minor workings stabilised by surface drilling and grouting, such as the work being done around St Albans and Welwyn in recent years, largely avoids this and these projects are run as civils sites with no MASHAM content.
I don't know about the 1980s Cornish shaft-capping programme. MASHAM was not then in its current form, plus the ownership of at least some of the shafts in question was known. I would guess that it was done as an M&Q Act project, partly because of ownership issues and partly because some degree of man entry must have been involved, and this was the defining criteria at Combe Down.
''the stopes soared beyond the range of our caplamps' - David Bick...... How times change .... oh, I don't know, I've still got a lamp like that.